Based on Shero Designs data the Magento Enterprise (EE) is $18,000 per year (enterprise business solution), large size businesses.

Magento Themes

Magento company doesn’t sell any themes but you might find useful free templates in Magento connect. Also you check out the wide range of amazing templates for Magento ecommerce platform in themeforest where prices start from $29 to $300.

Differences between Magento and Magento 1:

Magento is based on all versions of Magento.

Magento 1 is based on version 1.X of Magento.

Magento extensions

In Magento connect you will find huge range of extensions for marketing, SEO, analytics, integrations and etc. Brows more at magento connect.